	US 12,276,704 B2
	Maximum discharge current prediction method and battery system using the same
Sun Jong Lee, Daejeon (KR); and Cheoltaek Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 18/012,462
Filed by LG ENERGY SOLUTION, LTD., Seoul (KR)
PCT Filed Dec. 23, 2021, PCT No. PCT/KR2021/019712 § 371(c)(1), (2) Date Dec. 22, 2022, PCT Pub. No. WO2022/149769, PCT Pub. Date Jul. 14, 2022.
Claims priority of application No. 10-2021-0002662 (KR), filed on Jan. 8, 2021.
Prior Publication US 2023/0266402 A1, Aug. 24, 2023
Int. Cl. G01R 31/396 (2019.01); G01R 31/367 (2019.01); G01R 31/3842 (2019.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01); H01M 10/42 (2006.01)

CPC G01R 31/396 (2019.01) [G01R 31/367 (2019.01); G01R 31/3842 (2019.01); H01M 10/482 (2013.01); H01M 10/486 (2013.01); H02J 7/0047 (2013.01); H01M 2010/4271 (2013.01); H02J 7/007182 (2020.01)]

16 Claims

1. A method of predicting a maximum discharge current for a battery cell, the method comprising:

receiving a discharge time and a discharge limitation voltage for the battery cell;

setting a discharge reference voltage for the battery cell;

obtaining a proportional constant and an index parameter corresponding to the discharge reference voltage;

calculating a constant current for the discharge time by applying the proportional constant and the index parameter to a relation between the constant current and the discharge time during a discharge;

adjusting the discharge reference voltage in response to determining that a temporary discharge limitation voltage is greater than the discharge limitation voltage, the temporary discharge limitation voltage being a voltage reduced from the discharge reference voltage due to the constant current and an internal resistance of the battery cell;

predicting the maximum discharge current for the discharge time based on the constant current for the discharge time; and

controlling an operation of a vehicle by a controller based on the predicted maximum discharge current.